Previous research has revealed changes in the perception of objects due to changes of object-oriented actions. In present study, we varied the arm and finger postures in the context of a virtual reaching and grasping task and tested whether this manipulation can simultaneously affect the perceived size and distance of external objects. Participants manually controlled visual cursors, aiming at reaching and enclosing a distant target object, and judged the size and distance of this object. We observed that a visual–proprioceptive discrepancy introduced during the reaching part of the action simultaneously affected the judgments of target distance and of target size (Experiment 1). A related variation applied to the grasping part of the action affected the judgments of size, but not of distance of the target (Experiment 2). These results indicate that perceptual effects observed in the context of actions can directly arise through sensory integration of multimodal redundant signals and indirectly through perceptual constancy mechanisms.

先前的研究揭示了由于面向对象的行为的变化而导致的对象感知的变化。在目前的研究中，我们在虚拟伸手和抓取任务的背景下改变了手臂和手指的姿势，并测试了这种操作是否可以同时影响外部物体的感知大小和距离。参与者手动控制视觉光标，瞄准并包围远处的目标物体，并判断该物体的大小和距离。我们观察到在动作的到达部分引入的视觉-本体感受差异同时影响了对目标距离和目标大小的判断（实验 1）。应用于动作抓取部分的相关变化会影响大小判断，但不会影响目标距离（实验 2）。